Granted Patent
Utility
US 4,666,996 · App. 06/822,088
Crosslinking of polybenzimidazole polymer with divinyl sulfone
Inventor:
Michael J. Sansone
Patented Case
View Patent ↗
Granted: May 19, 1987
Filed: Jan 24, 1986
Inventor
Michael J. Sansone
Assignee (at issue)
Celanese GmbH
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.